''Dichotomanthes'' is a
monotypic
In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispec ...
genus of flowering plants belonging to the family
Rosaceae
Rosaceae (), the rose family, is a medium-sized family of flowering plants that includes 4,828 known species in 91 genera.
The name is derived from the type genus ''Rosa''. Among the most species-rich genera are ''Alchemilla'' (270), ''Sorbus ...
. The sole species is ''Dichotomanthes tristaniaecarpa''. The flower is
perigynous (sepals, petals and stamens around the edge of the ovary) the
ovary
The ovary is an organ in the female reproductive system that produces an ovum. When released, this travels down the fallopian tube into the uterus, where it may become fertilized by a sperm. There is an ovary () found on each side of the body. ...
is superior. The fruit of the plant is a dry
achene
An achene (; ), also sometimes called akene and occasionally achenium or achenocarp, is a type of simple dry fruit produced by many species of flowering plants. Achenes are monocarpellate (formed from one carpel) and indehiscent (they do not ope ...
.
Description
It is a small tree shrub, which reaches a size of 2-7 m in height. Gray-brown to grayish-brown beds when they are old; ovoid buds, initially tomentose, gradually glabrescent, apex obtuse or acute. Petiole 4-6 mm thick, thickly tomentose yellowish white; stipules deciduous, filiform, limb elliptic to oblong-lanceolate, sometimes obovate or oblanceolate, 3-6 × 1.5-2.5 cm, with lateral veins in 7-12 pairs, the underside densely tomentose yellowish white. The inflorescences of 2-5 × 3-6 mm, rachis and peduncles tomentose yellowish white; deciduous, lanceolate, membranous bracts. Pedicel 1-3 mm. Flowers 5-9 mm in diameter. White petals, 3-4 mm. Red, cylindrical fruit of 5-7 mm, hard. Flowers from April to May, Fruits from August to November.
Distribution
It is found in mixed evergreen forests, on the forest edges and hillsides, at elevations of 1300 - 2500 meters in Sichuan and Yunnan provinces of China.
References
External links
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Maleae
Monotypic Rosaceae genera
Flora of China
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